Python · Theory

casefold()

Theory

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casefold()

casefold is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

casefold() — output — ss. Stronger lower for caseless match.

Fresher trap: writing s.casefold() and expecting s to update. Strings are immutable. Write s = s.casefold(...) if you need the new value (when it returns a string).

Exam tip

Call casefold on one real word and say what prints.

Example

# casefold()
print("ß".casefold())

casefold() — output: ss. Stronger lower for caseless match.

Short notes

Defcasefold works on str.
Rulecasefold usually returns a new string.
Trapcasefold does not change the original string in place.

Python · Theory

casefold()

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Theory

209/268

casefold()

casefold is a string helper. You call it on text like "Asha" or "banana". It gives a new string (or a number/True-False). The old string does not change unless you assign the result back.

casefold() — output — ss. Stronger lower for caseless match.

Fresher trap: writing s.casefold() and expecting s to update. Strings are immutable. Write s = s.casefold(...) if you need the new value (when it returns a string).

Exam tip

Call casefold on one real word and say what prints.

Example

# casefold()
print("ß".casefold())

casefold() — output: ss. Stronger lower for caseless match.

Short notes

Defcasefold works on str.
Rulecasefold usually returns a new string.
Trapcasefold does not change the original string in place.

casefold()

Example

Short notes

Questions

casefold()

Example

Short notes

Questions